Freedom of expression is fought with more information!
There are already tools with, for example, a Gaussian algorithm, which detect tampering with videos and images, as well as deepfake, deepface and AI-generated videos. All that remains is for social networks to use them by creating a tag that identifies and alerts users of tampering.
Still, in juspositivism, you can demand financial compensation in case of negative externalities, injury, slander and defamation.
Therefore, there are already more legal guidelines to deal with these issues.